ASTER and USGS EROS Emergency Imaging for Hurricane Disasters
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1 ASTER and USGS EROS Emergency Imaging for Hurricane Disasters By Kenneth A. Duda and Michael Abrams Satellite images have been extremely useful in a variety of emergency response activities, including hurricane disasters. This article discusses the collaborative efforts of the U.S. Geological Survey (USGS), the Joint United States- Japan Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Science Team, and the National Aeronautics and Space Administration (NASA) in responding to crisis situations by tasking the ASTER instrument and rapidly providing information to initial responders. Insight is provided on the characteristics of the ASTER systems, and specific details are presented regarding Hurricane Katrina support. Introduction When a natural disaster strikes, responding agencies require timely information regarding the affected areas in order to rapidly summarize the situation and to plan relief and recovery efforts. Sensors aboard Earth-orbiting spacecraft acquire data at useful temporal frequencies and spatial resolutions within wavelength regions that enable the discrimination of surface features. Emergency response coordinators at the USGS Center for Earth Resources Observation and Science (EROS) have a lead role in acquiring and distributing such data to domestic and international organizations during times of crisis. The EROS Emergency Response team often calls upon staff at NASA s Land Processes Distributed Active Archive Center (LP DAAC), which is located at EROS, to assist in disaster response efforts. A petabyte-class facility (a petabyte is 1,24 terabytes, or 2 5 bytes), the LP DAAC archive contains over 19 million scenes of satellite imagery acquired by the Moderate Resolution Imaging Spectroradiometer (MODIS) and the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER). The LP DAAC group works closely with the ASTER Science Team to task this instrument and provide processed imagery. The data characteristics of the ASTER instrument are well suited to local and regional studies.
2 8 Science and the Storms: the USGS Response to the Hurricanes of 25 In addition to extensive data collection during the 25 U.S. hurricane season, the ASTER instrument has imaged numerous international disasters. The map presented in figure 1 provides examples of the wide variety of situations supported by the ASTER and LP DAAC teams in recent years. During 25, LP DAAC processed up to 2 scenes per month by using an emergency, or expedited, processing system. Processing consisted of using code received from affiliates in Japan to radiometrically calibrate and to geometrically coregister the data, applying intra- and intertelescope registration and including geolocation information. Intended to be a low-volume activity compared to standard acquisitions, the overall expedited mission production level peaked in February 25, largely in response to an Asian tsunami. Higher production levels later that year represented imaging of areas affected by hurricanes in the United States. In times of crisis, the value of the data is related to the information content as well as to the timeliness of delivery. Well-defined multiple-agency international processes and procedures were in place before the 25 hurricane season for acquiring satellite images and distributing data. This document will briefly summarize the ASTER mission and data characteristics, describe pre-event coordination, and provide examples of Hurricane Katrina imagery acquired by ASTER and MODIS. The Emergency Response team distributes data through the USGS s The National Map Hazards Data Distribution System ( Response/). Data specific to Katrina are provided at the USGS EROS Hurricane Katrina Disaster Response Web site ( eros.usgs.gov/katrina/). The ASTER Mission and Sensor Characteristics The ASTER project is a collaborative effort involving NASA, Japan s Ministry of Economy, Trade and Industry, and Japan s Earth Remote Sensing Data Analysis Center (ERSDAC) ( The ASTER instrument was launched in 1999 on the Terra spacecraft as part of NASA s Earth Observing System. Though the nominal ASTER design life has already been exceeded, the instrument continues to successfully perform its global mapping mission. The Terra spacecraft orbits Earth in minutes at an altitude of 438 mi (75 km), enabling ASTER to acquire repeat coverage of a location every 16 days or less with its mi (6-km) swath width. Further, ASTER s three telescopes can also be pointed off-nadir, or cross-track, enabling faster repeat coverage. The ASTER instrument acquires data through scheduled observations at an 8 percent duty cycle. Emergency, or expedited, scheduling provides a rapid-response capability, with data processed and available for use by investigators typically within 6 hours after collection. As depicted in figure 2, ASTER spectral coverage includes three bands in the visible and near infrared (VNIR), six bands in the shortwave infrared (SWIR), and five bands in the thermal infrared (TIR) regions of the electromagnetic spectrum. Ground resolutions are ft (15 m), ft (3 m), and ft (9 m) in VNIR, SWIR, and TIR, respectively. The ASTER instrument has both a VNIR Drought Volcano Glacier Wildfire Tornado Gases Landslide HURRICANE Flood Conflict Tsunami Antarctica Figure 1. Examples of global situations imaged by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER).
3 ASTER and USGS EROS Emergency Imaging for Hurricane Disasters 81 Atmospheric transmission (%) UV 1 VNIR VIS NIR SWIR MIR TIR ASTER LANDSAT ETM+ P L S C X K-band Wavelength.5 µm 1. µm 2. µm 5. µm 1. µm 1 µm 1 mm 1 cm 1 m Figure 2. Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) spectral bands superimposed on a model atmosphere. Landsat Enhanced Thematic Mapper Plus (ETM+) bands are provided for reference. The vertical dashed line marks the upper limit of visible wavelengths. Red boxes indicate the wavelength regions covered by the indicated ASTER bands, while blue boxes provide the same information for Landsat ETM+. UV = ultraviolet, VIS = visible, NIR = near infrared, VNIR = visible and near infrared, SWIR = shortwave infrared, MIR = middle infrared, and TIR = thermal infrared. (After Kääb and others, 22.) nadir and an aft-viewing band, which enables the generation of digital elevation models through observations from two different viewing positions. Standard data products include Level 1A Reconstructed Unprocessed Instrument Data and Level 1B Registered Radiance at the Sensor, as described at LP DAAC and ERSDAC Web sites ( and respectively). Level 1A data are depacketized, demultiplexed, and realigned instrument image data with their geometric correction coefficients and radiometric calibration coefficients calculated and appended but not applied. Level 1B products are created by applying the radiometric calibration and geometric correction coefficients to the Level 1A data. Both intratelescope and intertelescope registration correction for all the bands is accomplished relative to the reference band of each subsystem. Level 1B files are approximately 118 megabytes in volume. The LP DAAC archive currently contains over 1 million ASTER scenes. Numerous additional data products are created through custom processing initiated by customer requests. Prehurricane Preparations The EROS Emergency Response team and the LP DAAC have pre-established points of contact and backups for disaster-response activities. When advance notice of a significant event is available, as for a hurricane, experienced LP DAAC staff determines ASTER overpass opportunities for the anticipated impact areas and relay this information to the Emergency Response coordinators, who communicate with other organizations. Pre-event imagery in the data archive for the target areas is identified and ordered. The ASTER scheduling team at the Jet Propulsion Laboratory/ California Institute of Technology is alerted, and any planned spacecraft activity that might affect data collection is noted. International associates on the ASTER team in Japan will confirm scheduling through established procedures. In addition, data processing staff members at the LP DAAC are alerted, as they are required to convert data received to the more useful Level 1B version before distribution to customers. The LP DAAC developed the ASTER Overpass Predictor ( based on NASA s Satellite Overpass Predictor, to speed information delivery and interpretability. Several other internal processes and procedures have been developed and refined to ensure an accurate and quick response when a call for assistance is received. For U.S. hurricane events, the advisories of the National Weather Service s National Hurricane Center ( provide insight on the likely points of landfall. In addition, the hurricane position is monitored via regional moderate-resolution imagery such as MODIS. The ASTER schedulers typically require about 48 hours advance notice to assure collection. There may be a lag from the time of landfall to the time of first data availability depending on the Terra orbit, and clouds may also obscure the affected land surface. For significant events such as Katrina, multiple observations are scheduled to occur over several weeks.
4 82 Science and the Storms: the USGS Response to the Hurricanes of 25 Image Examples: Hurricane Katrina Katrina made landfall along the Louisiana-Mississippi border on August 29, 25, after having earlier crossed the Florida Peninsula. Loss of life and extensive property damage occurred. New satellite imagery was acquired over the affected areas as orbits and swath widths allowed. The first ASTER image collected in the area was of Baton Rouge, La., on August 3, 25. By October 5, 25, ASTER had acquired over 3 scenes along the Gulf Coast from Louisiana to Florida. In support of post-katrina efforts, EROS distributed over half a million files of data, or 1 terabytes (a terabyte is 1,24 gigabytes or 2 4 bytes) in volume, to over 15 Federal groups, to five States, and to several associations and universities. The Aqua MODIS view of the Gulf Coast in figure 3 after Katrina made landfall in Louisiana portrays the value of coarser resolution data, from which wider area coverage can be obtained at higher temporal resolution for regional studies. Many ASTER scenes were acquired along the Gulf Coast at the request of emergency coordinators after Hurricane Katrina made landfall. Figure 4 depicts the spatial extent of data acquired within approximately 5 weeks of the Louisiana landfall. In comparison with the MODIS image, the ASTER images in figure 5 before and after the event provide greater local detail. Flooded land areas appear dark in the lower image. In the ASTER excerpt enlarged in figure 6, more detail is apparent, and the demarcation between flooded and dry areas is visible as a near-vertical line south of the marina at top left, along the Jefferson-Orleans boundary. Interstate 61 crosses the scene horizontally in the lower portion of the image, and the University of is visible in the upper right corner. Street-level detail may be discerned from this ASTER data at ft (15-m) ground resolution. Conclusion 124 Miles 2 Kilometers The widely distributed coordination, flight operations, scheduling, processing, and data distribution teams described in this summary worked effectively across institutional and international boundaries as they responded to calls for assistance from local, State, and Federal organizations. The strong demand experienced for timely, high-resolution satellite imagery to characterize the devastation of the 25 hurricane season and other such catastrophic events suggests a continuing need for such data. The solid infrastructure in place prior to the catastrophes and the availability of an experienced workforce enabled rapid responses during times of crisis. Though operating beyond the nominal 5-year design life, the Terra spacecraft systems launched in 1999 currently remain available for future use as the need arises. Acknowledgments Figure 3. Aqua Moderate Resolution Imaging Spectroradiometer image of Hurricane Katrina acquired on August 29, 25, after Louisiana landfall. Work by Duda was performed at the USGS Center for Earth Resources Observation and Science under Science Applications International Corporation contract number 3CRCN1. Work by Abrams was performed at the Jet Propulsion Laboratory/California Institute of Technology under contract with NASA.
5 ASTER and USGS EROS Emergency Imaging for Hurricane Disasters 83 Alabama Mississippi Louisiana Florida Gulf of Mexico Miles Kilometers Figure 4. Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) scene footprints depicting Hurricane Katrina coverage acquired through October 5, 25. Each footprint, or rectangle, indicates the surface area covered by an acquired ASTER scene.
6 84 Science and the Storms: the USGS Response to the Hurricanes of 25 A Lake Pontchartrain Lakefront Airport University of Orleans Marina City Park 17th Street Canal London Avenue Outfall Canal Interstate 1 Inner Harbor Navigation Canal Jefferson Orleans Interstate 61 N 2116 Feet 645 Meters B Lake Pontchartrain University of Lakefront Airport Orleans Marina City Park 17th Street Canal breach London Avenue Outfall Canal breach Interstate 1 Inner Harbor Navigation Canal Jefferson Orleans Interstate 61 N 2116 Feet 645 Meters Figure 5. Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) images of, La., before (A) and after (B) Hurricane Katrina. The top image (A) is a mosaic from April and September 2. The bottom image (B) was acquired on September 13, 25. The darker areas in the bottom image (B) represent flooded regions. The Jefferson-Orleans boundary is represented by the dashed white line. Interstate 61 crosses the scene horizontally in the lower portion of the image. The University of is visible near the shoreline in the central portion of the image.
7 ASTER and USGS EROS Emergency Imaging for Hurricane Disasters 85 Lake Pontchartrain University of Contact Information A Orleans Marina Jefferson 17th Street Canal breach Orleans City Park Interstate 61 N London Avenue Outfall Canal breach 2116 Feet 645 Meters Kenneth A. Duda, Science Coordinator (duda@usgs.gov) NASA Land Processes Distributed Active Archive Center Science Applications International Corporation USGS Center for Earth Resources Observation and Science d St. Sioux Falls, SD Michael Abrams, U.S. ASTER Science Team Leader (michael.j.abrams@jpl.nasa.gov) Jet Propulsion Laboratory/California Institute of Technology Mail Stop Oak Grove Dr. Pasadena, CA 9119 Figure 6. September 13, 25, Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) image of, La. The darker areas represent flooded regions. The demarcation between flooded and dry areas is visible as a near-vertical line south of the marina at top left, along the Jefferson-Orleans boundary, which is represented by the dashed white line. Interstate 61 crosses the scene horizontally in the lower portion of the image, and the University of is visible in the upper right corner. B ASTER data are courtesy of NASA, Goddard Space Flight Center; Japan s Ministry of Economy, Trade and Industry; Japan s Earth Remote Sensing Data Analysis Center; Japan Resources Observation System Organization; and the United States/Japan ASTER Science Team. Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) data are courtesy of the NASA Earth Observatory and the MODIS Science Team. Reference Kääb, A., Huggel, C., Paul, F., Wessels, R., Raup, B., Kieffer, H., and Kargel, J., 22, Glacier monitoring from ASTER imagery accuracy and applications, in Proceedings of EARSeL-LISSIG-Workshop Observing Our Cryosphere from Space, Bern, March 11 13, 22, EARSeL Proceedings, v. 2, p , publications/kaeaeb_earsel.pdf, accessed October 27, 26.
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